Is it FOWLR or reef? A reef tank, with soft and LPS coral, should have a minimum of 10x per hour turnover. 15-20x per hour would be better. If you have a decent amount of water movement in the tank, and have no PH problems your probably alright. There are much better skimmers than the seaclone. IME the annoyance at the amount of micro-bubbles they produce is not worth the little it removes from the tank. JMO

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I thought that Clowns needed to be in pairs

No, they will do just fine on their own in an aquarium.

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How many fish would you recommend in a 25 gallons

Depends on the size of the fish, and your setup. The general rule of thumb for SW is 1" of adult fish per 5 gal aquarium water. A clown and the wrasse would put you at the limit, or close to it. HTH

Skimmer - Must admit that equipment is limited around my place...SeaClone was the only one offered to me and the only brand on the shelf. I seem to have a good water movement and at time the sand even moves...so I am assuming this is enough water movement.

LR - If I add another 15 pds will I be OK if I eventually go with corals? My current setup is FOWLR with 25pds of LR.

I am looking into changing my light setup to allow me to add some corals. I am currently looking for good prices as my LFS is offering me the lights at $400 cdn. Quite expensive in my area! Is it that much in the States?

You can move your LR aournd. I think a lot of us move stuff around or totally re-aquascape at least once.
For an anenmoe, you should have a mature tank of about 6-12months. I'm not sure on the corals (I'll let the expert reefers answer this).
What is the wattage of your light?

__________________Age is relative, you are only as old as you act....of course, this works in reverse....

I think the clown vs gramma debate has been settled anyway but just thought I'd add my 2 cents about adding a gramma to a tank with an established 6 line wrasse.....don't! I just did that and the gramma did not fare well at all. I think the gramma (or any other quiet fish) would need to be in there first before the 6 line or at the very least all the LR should be rearranged to break up the wrasse's territory. My wrasse took a big bite out of the gramma within 2 minutes of the gramma being in the tank. The gramma made it but is still hiding after almost a week and only occasionally peeks out from under his rock to look for food (he is eating which is great).

Reading every tread, does this mean I would be better removing the sixline and adding a clown and gramma? Starting to worry that the wrasse may be too territorial.. Certainly don't want to pay $30cdn for a clown to have the poor thing killed...